Security is not a product, but a process.

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14
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7answers
16k views

Automatically check for Security Updates on CentOS or Scientific Linux?

We have machines running RedHat-based distros such as CentOS or Scientific Linux. We want the systems to automatically notify us if there are any known vulnerabilities to the installed packages. ...
14
votes
3answers
1k views

What should I consider to secure SVN on Windows? [closed]

Currently I am using VisualSVN Server and it's only accessible on my home network. Eventually there will be others accessing it, but for now it's just me and I would like to be able to go down to the ...
14
votes
2answers
3k views

Auto-booting and Securing a Linux Server with an Encrypted Filesystem

I'm setting up some new Ubuntu servers, and I'd like to secure the data on them against theft. The threat model is attackers desiring the hardware or rather naïve attackers desiring the data. ...
14
votes
1answer
1k views

How to do a post-mortem of a server hack

I have a Windows Server 2003 SP2 machine with IIS6, SQL Server 2005, MySQL 5 and PHP 4.3 installed on it. This is not a production machine, but it is exposed to the world via a domain name. Remote ...
14
votes
2answers
3k views

Automatically Applying Security Updates for AWS Elastic Beanstalk

I've been a fan of Heroku since it's earliest days. But I like the fact that AWS Elastic Beanstalk gives you more control over the characteristics of the instances. One thing I love about Heroku is ...
14
votes
1answer
9k views

WEP/WPA/WPA2 and wifi sniffing

I know that WEP traffic can be "sniffed" by any user of the WIFI. I know that WPA/WPA2 traffic is encrypted using a different link key for each user, so they can't sniff traffic... unless they ...
14
votes
2answers
12k views

User per virtual host in Nginx

Is it possible in nginx configure different user per virtual host? Something like server { user myprojectuser myprojectgroup; ... }
13
votes
3answers
2k views

Enable SSH shell access but disable SFTP access

I've searched for a viable answer to this question, and most of the answers include advice on why to not do it. However, here's the scenario, and what makes it necessary: I have a console app, and in ...
13
votes
3answers
1k views

Log every command executed from root

I want to give access to my root server to an external system administrator, but i want to be sure to double check what he is doing to my server, e.g. copying data i don't want them to do and so on. I ...
13
votes
12answers
3k views

questionable timeservers in pool.ntp.org?

I've noticed that, after changing the reg settings outlined in Episode 52 of the Stack Overflow podcast to pool.ntp.org, my box keeps requesting time from gordo.foofus.net. The web site hosted on that ...
13
votes
6answers
7k views

How would you send syslog *securely* over the public Internet?

So I've got a few servers which I'd like to log centrally but obviously I don't want to pass the data insecurely over the internet. I've tried syslog-ng but can't make it work in a secure way, a ...
13
votes
4answers
2k views

Is iLO safe enough to be hung on the WAN

I am wondering if iLO is safe enough to be hung on the WAN, I looked for some articles but could not find any ? How do you guys secure iLO ? Do you put it behind a firewall ? Would you use a ...
13
votes
9answers
6k views

SSH server zero-day exploit - Suggestions to protect ourselves

According to the Internet Storm Center, there seems to be a SSH zero-day exploit out there. There is some proof of concept code in here and some reference: ...
13
votes
3answers
39k views

Iptables: How to allow only one ip through specific port?

How can I on my ubuntu server, in Iptables only allow one IP adress on a specific port? Thanks
13
votes
5answers
1k views

Git commit auditing

I have a git server running over ssh and each user has a unix account on the system. Given that two users have access to a repo, how can I be sure which user performed which commit, since the commit ...
13
votes
4answers
386 views

How to convince my Administrator that Java ON A SERVER is not insecure per se?

The Application We have a small Java application which uses some Camel routes to pick up uploaded files from a webserver, process them and send out some e-mails with the results. The server on which ...
13
votes
11answers
4k views

Chinese Hacker-Bots attempting to exploit our systems 24/7

Our sites our constantly under attack from bots with IP addresses resolving to China, attempting to exploit our systems. While their attacks are proving unsuccessful, they are a constant drain on our ...
13
votes
1answer
6k views

What is an open DNS resolver, and how can I protect my server from being misused by hackers?

I don't have the strongest background in computer security, but yesterday one of my company servers was shut down by our host. It's a server assigned a public IP where I host several web-service ...
13
votes
3answers
2k views

Does my Oracle DBA need root access?

My Oracle DBA Colleague is requesting root access on our production servers. He is arguing that he need it to perform some operations like rebooting the server and some other tasks. I do not not ...
13
votes
2answers
1k views

What is the difference between securing a linux box using hosts.[allow|deny] vs iptables?

As the title states, I have a linux box. As far as I can tell I can use hosts.allow / hosts.deny or iptables to secure. What's the difference? Is there another mechanism that can be used?
13
votes
5answers
1k views

Encrypted offsite backups - where to store the encryption key?

In addition to regular onsite backups (kept in a fire resistant safe), we also send tapes offsite once a month, encrypted with AES. So if our site is one day vaporised by an alien heat ray, we should ...
13
votes
2answers
9k views

How can I tell if my website is vulnerable to CVE-2014-3566 (POODLE)?

Google announced a vulnerability in the SSLv3 protocol that ... allows the plaintext of secure connections to be calculated by a network attacker. This vulnerability has been given the ...
13
votes
3answers
8k views

How to disable swap files in ESXi?

We are running a few Solaris / Linux VMs on ESXi that contain very sensitive encrypted data that eventually get decrypted as required in memory. Everything is fine, except for the ESXi swap files ...
13
votes
1answer
387 views

What is the Rowhammer DRAM bug and how should I treat it?

DRAM chips are very tightly packed. Research has shown that neighboring bits can be flipped at random. What is the probability of the bug triggering at random in a server-grade DRAM chip with ECC ...
13
votes
1answer
529 views

“Hostile” network in the company - please comment on a security setup

I have a little specific problem here that I want (need) to solve in a satisfactory way. My company has multiple (IPv4) networks that are controlled by our router sitting in the middle. Typical ...
13
votes
2answers
1k views

Has anyone got billed for malicious activities (DDoS) on a cloud server? [closed]

I would like to know if anyone got billed beyond expectation on a cloud service because of malicious activities (DDoS, etc)? How does EC2 and/or Rackspace Cloud handle these issues? Thank you!
13
votes
4answers
910 views

Reliable software keylogger detection?

I may be dreaming here, But is there a reliable method for keylogger software detection? I'm primarily a developer but I run a couple servers and the thing that worries me most is a software ...
13
votes
3answers
3k views

SELinux vs. AppArmor vs. grsecurity

I have to set up a server that should be as secure as possible. Which security enhancement would you use and why, SELinux, AppArmor or grsecurity? Can you give me some tips, hints, pros/cons for those ...
13
votes
2answers
3k views

The Story of secure user-authentication in squid

once upon a time, there was a beautiful warm virtual-jungle in south america, and a squid server lived there. here is an perceptual image of the network: <the Internet> ...
12
votes
17answers
1k views

What are the arguments for and against a network policy where the sys admin knows users passwords? [closed]

I'd like to know pros and cons.. reasons for and against the idea of sys admin’s maintaining user account lists with passwords.. and additionally not allowing those users to change their passwords. I ...
12
votes
23answers
2k views

Is being paranoid a required 'quality' for Sys/Net administrators?

Is being Paranoid considered an (unspoken) 'requirement' for a Sys/Net admin to have (obviously for security reasons)? Is there such a thing as being overly paranoid?, or should we be trustful of ...
12
votes
7answers
2k views

Preventing theft of data on remotely deployed servers exposed to physical access [closed]

I am trying to think of a way to secure Linux servers that are exposed to physical access. My specific platform are small form factor Linux servers on a PC Engines brand alix2d13 mother board. The ...
12
votes
13answers
6k views

what's a secure way to send passwords over the internet?

I'm looking for the best way to send passwords over the internet safely. Options I've looked at are PGP and encrypted RAR files. There are no real parameters other than getting from point a to point ...
12
votes
3answers
2k views

Is it really secure to connect to a server by SSH from hotels during a journey?

Is it really secure to connect to a server using SSH from hotels during a journey? Server: - CentOS 7 - Authorisation only by RSA key - password auth is denied - Non-standard port Workstation: - ...
12
votes
8answers
2k views

is this a hack attempt?

Looking through my 404 logs I noticed the following two URLs, both of which occurred once: /library.php=../../../../../../../../../../../../../../../../../../../../../../../../proc/self/environ and ...
12
votes
13answers
3k views

Password expiration policies [closed]

Having just received an email from a supplier informing us that they would be forcing us to change our password every six months, I'm curious to see what password expiration policies people use and ...
12
votes
4answers
1k views

How do I deal with the removal/eradication of an unknown worm on our network?

TL;DR I'm pretty sure our small network has been infected by some sort of worm/virus. It seems to only be afflicting our Windows XP machines, however. Windows 7 machines and Linux (well, yea) ...
12
votes
2answers
5k views

Can someone please explain Windows Service Principle Names (SPNs) without oversimplifying?

I have wrestled with service principle names a few times now and the Microsoft explanation is just not sufficient. I am configuring an IIS application to work on our domain and it looks like some of ...
12
votes
7answers
3k views

Storing rarely used single-purpose passwords

How do you handle the storage of passwords that, by nature of their usage, you can't expect administrators to memorize? Such as: Administrator/root password when everyone logs on using their own ...
12
votes
2answers
19k views

How to check if a RSA public / private key pair matched

I have two files, id_rsa and id_rsa.pub, what command can be used to validate if they are the valid pair.
12
votes
5answers
19k views

A secure, standard iptables rule-set for a basic HTTP(s) webserver

I have been trying to put together a basic server iptables script that will work for most sites just running a basic webserver using HTTP(S) and SSH (ports 80, 443, & 22). After all, most VPS only ...
12
votes
2answers
718 views

How to Isolate PCI Compliance

We currently process, but do not store, credit card data. We authorize the cards via a self developed application using the authorize.net API. If possible, we would like to limit all requirements of ...
12
votes
6answers
19k views

Securing a SuperMicro IPMI BMC

I've recently acquired a SuperMicro X8DTU-F motherboard, which has a built-in BMC, which basically runs the IPMI system. It turns out to be a small Linux system running on an ARM processor. ...
12
votes
3answers
1k views

Server credential management for Linux and Windows

We are a relatively small shop (as far as number of sysadmins) with a mix of RHEL, Solaris, Windows 2003 and Windows 2008 servers; about 200 servers in all. For our administrator accounts (root in ...
12
votes
2answers
8k views

Anything Close to an NSA Guide for Securing RHEL 6 [closed]

Some in our infrastructure group want to upgrade to start taking advantage of the new features in RHEL 6. In the past, I have relied on the NSA Guide ...
12
votes
4answers
9k views

Is there a windows equivalent to chroot?

On a *nix system I can use a chroot to isolate 2 processes from each other and from the rest of the system. Is there any similar security system under windows? Or is there any way to prevent 2 ...
12
votes
5answers
2k views

Reviewing firewall rules

I need to review firewall rules of a CheckPoint firewall for a customer (with 200+ rules). I have used FWDoc in the past to extract the rules and convert them to other formats but there was some ...
12
votes
3answers
933 views

Access control: Windows vs Linux

I'm reading MIT 6.893 lectures on which it says protection in Unix is a mess, no underlying principle, and it also points out that Windows has better alternatives, which can pass privileges from one ...
11
votes
11answers
1k views

Site hacked, looking for security advice [duplicate]

Possible Duplicate: My server's been hacked EMERGENCY Last weekend my company's site was hacked. They did the nicest thing of doing that on a Friday evening so we only noticed the ...
11
votes
5answers
3k views

Does Linux really need Anti-Virus (other than hosted file scanning)

A large company is doing a review of our software before they will use the web software built by our start-up company. We are using Linux to host, which is properly secured and hardened. The ...